C.steel sleeve: in case based on process request, if the length is more than 30m, the steel base support could be used through chief tube forepart &removed as repeated usage purpose.

　
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  • C.；鋼套管 套管為鋼制套管時(shí)，根據施工工藝要求，若套管長(cháng)度大于30米，主管穿越前端可使用鋼制托管支撐，當穿越主管出套管后，托管支撐拆掉后可供重復使用。
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